@elie.soulard_1: unlike the "smart" dimensioning, the symbol function for drilling hooks to the pilot hole (I just tested on SW19).
Is it specific to the room (i.e. if you start a new MEP with the same room, the phenomenon is repeated), to the MEP (you add a view of another room in the MEP)?
Reset your profile to see if it fixes your problem (if it fixes the problem it's a parameter to correct otherwise it comes from a missing file installation problem)
Of course, you can restore your profile if needed.
To reset your profile:
Go to regedit (start, run regedit) and then Rename:
HKEY_CURRENT_USER\Software\Solidworks\SolidWorks 20xx depending on the version you want to reset. (usually I add -old at the very end of the name)
When you restart SW, you will have the "factory" settings
If you need to go back, rename or delete the folder that was created when you reopened SW (HKEY_CURRENT_USER\Software\Solidworks\SolidWorks 20xx)
And rename the 1st previous -old folder without the -old then reopen SW