[su_tabs] not working properly

I use the structure below to create bilingual pages. It all worked perfectly. The disarray happened after the last WP update. All other pages are working except one in which only “language 1” content appears; “language 2″ tab appears but not the content. I have compared the syntax between the two tabs’ content. Everything matches.

What I have done:
– replaced title for language 2 with word without diacritic – no help
– removed and recreated content – no help
– compared syntax with language 1 content – no help

I have checked the page in three browsers, all latest updates: Chrome, Edge and FireFox.

Thank you for your comments and suggestions.

[su_tabs] [su_tab title=”language 1″]

CONTENT

[/su_tab]

[su_tab title=”language 2”]

CONTENT

[/su_tab]

[/su_tabs]