Reloaddns throws error

When trying to run reloaddns command Pi-hole throws an unexpcted error but still seems to execute the command:

piman@Pi-Box:~ $ sudo pihole reloaddns
/opt/pihole/utils.sh: line 100: local: FTL_PID_FILE: readonly variable
[✓] Flushing DNS cache

Anything I should worry about?

Core version is v6.4.2 (Latest: v6.4.2)
Web version is v6.5 (Latest: v6.5)
FTL version is v6.6.2 (Latest: v6.6.2)

Known issue. Searching leads to this: Pihole status warning: FTL_PID_FILE: readonly variable - #2 by darkexplosiveqwx