I have already asked twice cause I have had the same problem for several months but got no answer till date. Hopefully soon.
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This reply was modified 6 years, 5 months ago by nessi1963.
Hi Solveo, I have the same problem and asked for support a month ago (https://wordpress.org/support/topic/polylang-problem-with-saving-keywords/) but got no reply. I handle it by deactivating the plugin for setting category and keywords and afterwards activating it again. Not an elegant solution, but at least one that works. I look forward to better ideas …