Admin search not working

When searching for a name in the admin, I get a “This site can’t be reached” error page. The resulting URL output seems to be the problem because when I remove this string from the end, the results display fine:

&_wpnonce=9263d27d28&_wp_http_referer=%2Fwp-admin%2Fedit.php%3Fpost_type%3Dstaff-member&action=-1&m=0&paged=1&cd_menu_order%5B3859%5D=-4&cd_menu_order%5B3860%5D=-4&cd_menu_order%5B4148%5D=-2&cd_menu_order%5B3453%5D=-2&cd_menu_order%5B8728%5D=-1&cd_menu_order%5B3876%5D=-1&cd_menu_order%5B4163%5D=-1&cd_menu_order%5B4442%5D=-1&cd_menu_order%5B4443%5D=-1&cd_menu_order%5B3690%5D=-1&cd_menu_order%5B4232%5D=-1&cd_menu_order%5B3832%5D=-1&cd_menu_order%5B6919%5D=0&cd_menu_order%5B4108%5D=0&cd_menu_order%5B4109%5D=0&cd_menu_order%5B3855%5D=0&cd_menu_order%5B3858%5D=0&cd_menu_order%5B3861%5D=0&cd_menu_order%5B8473%5D=0&cd_menu_order%5B3866%5D=0&cd_menu_order%5B4634%5D=0&cd_menu_order%5B3867%5D=0&cd_menu_order%5B4635%5D=0&cd_menu_order%5B3868%5D=0&cd_menu_order%5B3870%5D=0&cd_menu_order%5B4382%5D=0&cd_menu_order%5B6942%5D=0&cd_menu_order%5B8990%5D=0&cd_menu_order%5B3871%5D=0&cd_menu_order%5B3872%5D=0&cd_menu_order%5B4642%5D=0&cd_menu_order%5B3875%5D=0&cd_menu_order%5B6947%5D=0&cd_menu_order%5B3877%5D=0&cd_menu_order%5B3878%5D=0&cd_menu_order%5B4146%5D=0&cd_menu_order%5B8244%5D=0&cd_menu_order%5B4405%5D=0&cd_menu_order%5B4406%5D=0&cd_menu_order%5B4408%5D=0&cd_menu_order%5B4154%5D=0&cd_menu_order%5B4666%5D=0&cd_menu_order%5B4428%5D=0&cd_menu_order%5B8013%5D=0&cd_menu_order%5B8014%5D=0&cd_menu_order%5B4175%5D=0&cd_menu_order%5B8015%5D=0&cd_menu_order%5B4176%5D=0&cd_menu_order%5B4177%5D=0&cd_menu_order%5B3924%5D=0&cd_menu_order%5B6233%5D=0&cd_menu_order%5B5213%5D=0&cd_menu_order%5B7784%5D=0&cd_menu_order%5B3689%5D=0&cd_menu_order%5B3691%5D=0&cd_menu_order%5B3692%5D=0&cd_menu_order%5B4205%5D=0&cd_menu_order%5B3694%5D=0&cd_menu_order%5B3695%5D=0&cd_menu_order%5B5744%5D=0&cd_menu_order%5B3698%5D=0&cd_menu_order%5B3699%5D=0&cd_menu_order%5B4723%5D=0&cd_menu_order%5B4214%5D=0&cd_menu_order%5B10107%5D=0&cd_menu_order%5B3965%5D=0&cd_menu_order%5B4222%5D=0&cd_menu_order%5B3975%5D=0&cd_menu_order%5B3976%5D=0&cd_menu_order%5B4234%5D=0&cd_menu_order%5B3472%5D=0&cd_menu_order%5B4244%5D=0&cd_menu_order%5B4254%5D=0&cd_menu_order%5B4766%5D=0&cd_menu_order%5B4255%5D=0&cd_menu_order%5B7583%5D=0&cd_menu_order%5B4256%5D=0&cd_menu_order%5B7584%5D=0&cd_menu_order%5B4257%5D=0&cd_menu_order%5B7585%5D=0&cd_menu_order%5B4002%5D=0&cd_menu_order%5B4258%5D=0&cd_menu_order%5B7586%5D=0&cd_menu_order%5B4259%5D=0&cd_menu_order%5B4008%5D=0&cd_menu_order%5B5288%5D=0&cd_menu_order%5B5289%5D=0&cd_menu_order%5B8617%5D=0&cd_menu_order%5B4012%5D=0&cd_menu_order%5B4013%5D=0&cd_menu_order%5B4270%5D=0&cd_menu_order%5B5038%5D=0&cd_menu_order%5B4271%5D=0&cd_menu_order%5B5039%5D=0&cd_menu_order%5B5040%5D=0&cd_menu_order%5B5042%5D=0&cd_menu_order%5B4023%5D=0&cd_menu_order%5B4279%5D=0&cd_menu_order%5B4280%5D=0&cd_menu_order%5B4792%5D=0&cd_menu_order%5B4793%5D=0&cd_menu_order%5B4794%5D=0&cd_menu_order%5B4283%5D=0&cd_menu_order%5B4795%5D=0&cd_menu_order%5B4796%5D=0&cd_menu_order%5B4797%5D=0&cd_menu_order%5B4798%5D=0&cd_menu_order%5B4799%5D=0&cd_menu_order%5B7615%5D=0&cd_menu_order%5B7871%5D=0&cd_menu_order%5B4288%5D=0&cd_menu_order%5B4800%5D=0&cd_menu_order%5B4289%5D=0&cd_menu_order%5B4801%5D=0&cd_menu_order%5B7873%5D=0&cd_menu_order%5B4802%5D=0&cd_menu_order%5B7874%5D=0&cd_menu_order%5B4803%5D=0&cd_menu_order%5B7875%5D=0&cd_menu_order%5B4036%5D=0&cd_menu_order%5B4804%5D=0&cd_menu_order%5B7876%5D=0&cd_menu_order%5B4037%5D=0&cd_menu_order%5B4293%5D=0&cd_menu_order%5B4805%5D=0&cd_menu_order%5B4038%5D=0&cd_menu_order%5B4806%5D=0&cd_menu_order%5B4039%5D=0&cd_menu_order%5B4807%5D=0&cd_menu_order%5B4040%5D=0&cd_menu_order%5B4808%5D=0&cd_menu_order%5B4809%5D=0&cd_menu_order%5B4042%5D=0&cd_menu_order%5B4810%5D=0&cd_menu_order%5B4811%5D=0&cd_menu_order%5B4812%5D=0&cd_menu_order%5B4813%5D=0&cd_menu_order%5B4814%5D=0&cd_menu_order%5B4559%5D=0&cd_menu_order%5B4815%5D=0&cd_menu_order%5B3792%5D=0&cd_menu_order%5B4816%5D=0&cd_menu_order%5B3793%5D=0&cd_menu_order%5B4817%5D=0&cd_menu_order%5B4818%5D=0&cd_menu_order%5B4563%5D=0&cd_menu_order%5B4819%5D=0&cd_menu_order%5B4820%5D=0&cd_menu_order%5B4821%5D=0&cd_menu_order%5B4822%5D=0&cd_menu_order%5B4056%5D=0&cd_menu_order%5B4824%5D=0&cd_menu_order%5B4057%5D=0&cd_menu_order%5B4569%5D=0&cd_menu_order%5B4825%5D=0&cd_menu_order%5B4826%5D=0&cd_menu_order%5B4828%5D=0&cd_menu_order%5B4829%5D=0&cd_menu_order%5B9693%5D=0&cd_menu_order%5B3806%5D=0&cd_menu_order%5B4830%5D=0&cd_menu_order%5B3807%5D=0&cd_menu_order%5B4831%5D=0&cd_menu_order%5B4832%5D=0&cd_menu_order%5B4065%5D=0&cd_menu_order%5B4833%5D=0&cd_menu_order%5B4066%5D=0&cd_menu_order%5B4834%5D=0&cd_menu_order%5B4840%5D=0&cd_menu_order%5B6892%5D=0&cd_menu_order%5B4081%5D=0&cd_menu_order%5B4593%5D=0&cd_menu_order%5B4338%5D=0&cd_menu_order%5B4594%5D=0&cd_menu_order%5B4595%5D=0&cd_menu_order%5B4596%5D=0&cd_menu_order%5B7926%5D=0&cd_menu_order%5B7927%5D=0&cd_menu_order%5B7928%5D=0&cd_menu_order%5B4090%5D=0&cd_menu_order%5B3836%5D=0&cd_menu_order%5B6398%5D=0&cd_menu_order%5B3864%5D=1&cd_menu_order%5B3696%5D=1&cd_menu_order%5B3697%5D=1&cd_menu_order%5B3700%5D=1&cd_menu_order%5B4724%5D=1&cd_menu_order%5B3701%5D=1&cd_menu_order%5B3702%5D=1&cd_menu_order%5B4014%5D=1&cd_menu_order%5B4332%5D=1&cd_menu_order%5B4199%5D=2&cd_menu_order%5B4242%5D=2&cd_menu_order%5B5076%5D=2&cd_menu_order%5B3448%5D=10&cd_menu_order%5B3449%5D=10&cd_menu_order%5B3451%5D=10&cd_menu_order%5B3455%5D=10&cd_menu_order%5B3457%5D=10&cd_menu_order%5B3458%5D=10&cd_menu_order%5B3459%5D=10&cd_menu_order%5B3460%5D=10&cd_menu_order%5B3461%5D=10&cd_menu_order%5B3462%5D=10&cd_menu_order%5B3463%5D=10&cd_menu_order%5B3464%5D=10&cd_menu_order%5B3465%5D=10&cd_menu_order%5B3466%5D=10&cd_menu_order%5B3467%5D=10&cd_menu_order%5B3468%5D=10&cd_menu_order%5B3469%5D=10&cd_menu_order%5B3470%5D=10&cd_menu_order%5B3471%5D=10&cd_menu_order%5B3473%5D=10&cd_menu_order%5B3474%5D=10&cd_menu_order%5B3475%5D=10&cd_menu_order%5B3476%5D=10&cd_menu_order%5B3477%5D=10&cd_menu_order%5B3478%5D=10&cd_menu_order%5B3479%5D=10&cd_menu_order%5B3480%5D=10&cd_menu_order%5B3481%5D=10&cd_menu_order%5B3482%5D=10&cd_menu_order%5B3483%5D=10&cd_menu_order%5B3484%5D=10&action2=-1

Wordpress version: 5.6.2
Plugin: latest free version
When turning off all other plugins, theme the error persists.