I have the same issue, but the other way around. I cannot charge my laptop (framework 13, amd) from my power bank. Which sometimes would be super useful.
I don't know nor understand why it doesn't work and if it's a bug in the power bank or the laptop
I have a Framework 13 and I've found that it's fairly finicky about what power sources it will accept. Anything 60W and higher seems to mostly work, but lower wattage chargers are much more dicey.
The one trick I've heard works (but haven't tried) is to "kick start" it by connecting two chargers, one with higher wattage and one with lower, then giving it a minute to begin charging, then disconnecting the higher-powered one. Apparently that's enough to get it past the initial issue and then it will continue charging (more slowly) from the lower wattage charger.
There was a firmware update a while back that was supposed to improve things, but it didn't change the behavior with my 27W charger.
As another data point, the firmware update fixed everything for me and I have no problems charging my Framework 13 from my 18w Pixel charger or 20w iPad charger.
I don't know nor understand why it doesn't work and if it's a bug in the power bank or the laptop