WordPress won’t save page/post with more than 332 words

I am answering my own question to mark the solution that worked for me.

I have moved the site to a different hosting company. All works as expected with no changes made to the site.

Still unaware where the problem was. According the the old host, it’s a WordPress issue. Yet again, new host -> functioning site.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)