Can't add/update posts

Hi, i have similar issue to https://forum.muffingroup.com/betheme/discussion/51345/can-t-update-my-posts/p1 ("Error message: The response is not a valid JSON")

My Max_Input_Vars has recommended value (5000) so solution from this post does not apply to my situation.

My hosting environment settings https://prnt.sc/r0lo5i

Can You help?

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