When an angled, unactivated powered rail and trip wire is setup as shown, and a minecart nudged into just the right position, the tripwire is triggered repeatedly, which shows both with the redstone output repeatedly turning on and off and the tripwire click sound playing repeatedly.
The rate of the repeat is consistent at about 2 per second.
World and Animated gif of a screen recording attached.
This is still an issue with the experimental minecart improvements datapack enabled.
Affects 1.16 Release Candidate 1