A hard and fast rule is only a rule when it suits.
help align the teams towards Agile, not to hold the teams back
While I am very supportive of most frameworks, these should be there to help align the teams towards Agile, not to hold the teams back. Abandon the rule if it is not helping the team towards becoming fully Agile.
Remember, a framework is not Agile in itself and the team should be working towards a fully agile team.
Spotify noticed this with their teams a few years ago and started making small changes which lead to a whole new growing and forever changing “framework” of their own that favours the agile mindset over any rules.