Do you really mean "disable", not enable? They were automatically disabled after the update and this is where the issue started. Enabling seens to have solved it. Kind of. I enabled all four yesterday and just checked again. Two were disabled again, two still enabled.Just disabling all 4 of them should work.

Checked the logs, I see the event of me enabling h3 and h4 yesterday and h1 and h2 the day before yesterday. There is however no log entry for enabling h3 and h4 despite I definitively did that, so it seems these were not recognized, whyever. Maybe I rushed to another page of the ACP too fast after switching them on.Check your admincp log, none of my add-ons toggle the enable/disable state outside of the setup/installer code
- Fix "Allow users to convert transparent colored post text into an inline-spoiler" option didn't load selectable text styling override as expected for dark styles for XF2.3
So it seems that 1.18.2 has deactivated those codes but failed to replace the exiting BB-Codes in postings.
Just upgraded from 1.18.2 to 1.18.4 and immediately after the update h1 - h4 were deactivated again and I had to activate them manually. So the issue persists with ever update and is clearly tied to the update.Those are all activated, I think the logic around only partially activating the custom h1/h2/h3/h4 bb-codes is somewhat buggy.

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