Messages not shown

[synapticweb]

When loading a conversation with 1231 messages no message is shown, only "Please select a conversation from the list to load it" is shown, no message. The other conversations with less messages are unaffected. All messages are present in the database. No suspect errors in [datadir]/nextcloud.log. (There are other log files?) Just deprecation warnings in the browser console. Tested on desktop with Firefox 78 and Brave 81 and on mobile with brave 1.11.

Server configuration

**Nextcloud version: 19.1 **

PHP version: 7.3.20

**HTTPd server: LiteSpeed V7.6 **

Database engine & version: MariaDb 10.3.23

[synapticweb]

While playing with the database I just found out that the issue has no relationship with the number of messages in conversation: when the sms_address field contains a space, the messages are not shown. Replacing the space with a _ fixed the problem.