WP sending emails with Base64 subject in header

  • WP Auctions Pro plugin version 5.8 sends emails to bidders to acknowledge every bid. With WordPress 5.4.9 and earlier, and PHP 7.4, the site performs flawlessly. After upgrading to WordPress 5.5 or later, the site still performs flawlessly except that the subject text of emails displays in Base64. Here is an example email subject from WP 5.5:

    =?utf-8?b?W1Nvcm9wdGltaXN0IFdhbGxvd2EgQ291bnR5IEF1Y3Rpb25dIFlvdSBoYXZlIGJlZW4gb3V0YmlkIG9uIFdhbGwgUGxhcXVl?=

    Decoding this Base64 text yields

    [Soroptimist Wallowa County Auction] You have been outbid on Wall Plaque

    which verifies that the content is correct, just encoded inappropriately. Understandably, recipients find these Base64 subject headers confusing or threatening.

    In moving from WP 5.4.9 to WP 5.5, the only change is the WP version number. Any suggestions for how to fix this?

    The page I need help with: [log in to see the link]

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