Hi, @Babbles.
No worries and thank you for the clarification. As per your statement here, it seems that the Channel search is working though it requires you to delete the character:
Since it does work for Posts normally (assuming that MariaDB was restarted after all the changes were made), I would like to understand the differences between these 2 tables here. Can you please run the following command on your SQL terminal and provide the outputs?
SHOW TABLE STATUS WHERE Name = "Channels"\G
SHOW TABLE STATUS WHERE Name = "Posts"\G
If they are the same, there might be a potential bug specific to the Channel search though it is yet to be fully confirmed.