SUMMARY
***
I have 3 databases I often work on. I noticed that in version 5.1.2, when I open the 3 databases through the "File" > "Open Recent" option, it grays out. I need to quit the application to get it enabled again. Every time I repeat the process, the option grays out again.
***

STEPS TO REPRODUCE
0. Pre-condition: I have 3 databases under the Open Recent option. (If you have other number, do the same thing with all of them)
1. From current database 1, open database 2 through the "Open Recent" option
2. From current database 2, open database 3 through the "Open Recent" option
3. From current database 3, open database 1 through the "Open Recent" option, and you'll find the option is grayed out.

OBSERVED RESULT
When all databases are opened through the "File" > "Open Recent" option, it grays out.

EXPECTED RESULT
The "File" > "Open Recent" option should never gray out when you have recently opened any database.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version:  5.15.3

ADDITIONAL INFORMATION
Kernel version: 5.17.3