bbPress.org

Hi, I am using bbPress to run a forum where my users can upload contents on it.
everything was working fine until few days ago I realized that whenever I tried to click on a topic in a specific forum, Critical Error occured in WordPress. By downgrading PHP version to 7.4 from 8.0, I managed to access the topics again. However, now I am unable to see the reply’s contents neither the attachements (my users can upload file in reply as well).

Strangely, when I click EDIT in reply, I can see the reply in texts (attachments do not show though) but when I hit the Submit button, the reply box is still blank.
I checked the Replies box in WordPress admin and I can see they are correctly linked to the topic.

Can somebody help me? I have been looking through a respectful amount online but I could not find a solution 🙁

### wp-plugins-active (15) ###

Akismet Anti-Spam: version: 5.1, author: Automattic, Updates managed by WordPress.com
bbP Members Only: version: 1.0.1, author: Jared Atchison, Auto-updates disabled
bbPress: version: 2.6.9, author: The bbPress Contributors, Auto-updates disabled
bbPress WP Tweaks: version: 1.4.4, author: veppa, Auto-updates disabled
bbp style pack: version: 5.5.3, author: Robin Wilson, Auto-updates disabled
Classic Editor: version: 1.6.3, author: WordPress Contributors, Updates managed by WordPress.com
GD bbPress Attachments: version: 4.5, author: Milan Petrovic, Auto-updates disabled
GenerateBlocks: version: 1.7.3, author: Tom Usborne, Auto-updates disabled
GP Premium: version: 2.3.1, author: Tom Usborne, Auto-updates disabled
Jetpack: version: 12.2-a.5, author: Automattic, Updates managed by WordPress.com
Layout Grid: version: 1.8.2, author: Automattic, Updates managed by WordPress.com
Page Builder by SiteOrigin: version: 2.22.1, author: SiteOrigin, Auto-updates disabled
Page Optimize: version: 0.5.3, author: Automattic, Updates managed by WordPress.com
SiteOrigin Widgets Bundle: version: 1.49.2, author: SiteOrigin, Auto-updates disabled
Ultimate Member: version: 2.5.2, author: Ultimate Member (latest version: 2.6.0), Auto-updates disabled

### wp-plugins-inactive (3) ###

Crowdsignal Forms: version: 1.7.0, author: Automattic, Updates managed by WordPress.com
Gutenberg: version: 15.7.1, author: Gutenberg Team, Updates managed by WordPress.com
WordPress.com Editing Toolkit: version: 3.65244, author: Automattic, Updates managed by WordPress.com