Unifi Switch offering to downgrade it’s firmware?

Today I realised in the Unifi App that my Unifi Switch is offering a downgrade firmware from to

It usually shows upgrades, not downgrades. What is the reason behind this?

After further research I discovered that:

"There was a regression in 4.0.67 until 4.0.73 which would block DHCP traffic over the 6th LAG interface. That was fixed in 4.0.73, but there are stability problems related to DHCP snooping in 4.0.73 which might spontaneously reboot switches. While that's being identified and resolved, the last safe stable version for all use cases is 4.0.66.

If you're on a newer version than that and not having any problems, then there's no need to downgrade."

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