WP: 6.8.1 (latest).
bbPress: 2.6.13 (latest).
bbPress Move Topics 1.1.6 (latest).
bbp style pack: 6.3.9 (latest).
themes: Twenty Fifteen and Twenty Twenty-five.
site: https://hollandnumerics.org.uk

Forum topic contains <TABLE>, <TBODY>, <TR> and <TD> HTML tags.

1. Able to edit title, body, tags in Forum Topic.
2. Clicking [Update] starts update.
3. Edit viewer disappears and Post list appears.
4. Forum Topic is unchanged.
5. No error messages.

Have also tried moving Topic to Page, but this fails to change type.
Creating new Forum Topic with copy of body text also does not complete.

[@hollandnumerics Participant 11 hours, 51 minutes ago]

However, in Troubleshooting Mode, updated topic “test 3” is being shown correctly.

Active plugins: bbPress and bbp style pack

[@robin-w Moderator 9 hours, 43 minutes ago]

I can’t fix the error until you get your admin emails working !!

so the admin email address in

dashboard>settings>general need to be a valid and working email, you can’t run a site without this working, so I think as a first action you need to fix this.

when you have, come back

[@hollandnumerics Participant 7 hours, 49 minutes ago]

But that email address (which is an alias) does work, and has not been changed since it was assigned as the Admin email address in 2015. OK some of the emails from the blog site get stuck in the Sent folder, but I still can read them there.

Does that email address have to match the out-going email address? It doesn’t because my ISP forces me to use a @hollandnumerics.com address for out-going emails

[@robin-w Moderator 6 hours, 21 minutes ago]

email does not have to match, but lots of things in between the send and recieve can jink emails they consider spam or suspicious.

So if you are not getting the error emails, can I suggest you install

Check & Log Email – Easy Email Testing & Mail logging

and use this to test emails, and if the site attempts to send an email, the email logs can tell you what it tried to send.