Text Replacement is malfunctioning

Hi, when using text replacement integrated with the OS, MailSpring is replacing the next text incorrectly. For example, if I have ‘ttyl’ set to be replaced by “Talk To You Later,” this is what MailSpring converts it to:
ttyl Talk To You Later
So it keeps the original shortcut instead of deleting it, and it moves the cursor 4 characters in from the right since the shortcut is four characters. Super annoying!

I don’t find this issue with any other apps/programs. Anyone else see this problem? Any ideas or solutions? Thanks!

[MacOS Ventura 13.2]