Rational Resampler is dropping stream tags

[eltos]

What happened?

The tag propagation for Rational Resampler Block seams to be broken: It sometimes undeterministically drops tags.
As the block is using the default tag propagation mechanism of the scheduler around these lines, the issue likely affects other interpolating blocks likewiese.
A Repeat Block used in the same place does not suffer from this issue (as it is handling tag propagation internally, and is not using the default tag propagation policy).

Possibly related to #2056, however here I am not changing interpolation at runtime, but using a fixed value from the beginning.

This happens rather rarely, and it is not yet clear what exactly causes the issue.

System Information

OS: Linux Ubuntu
GR Installation Method: build from source

GNU Radio Version

3.10 (maint-3.10)

Specific Version

3.10.8.0

Steps to Reproduce the Problem

Example flowgraph: test_resampler_tag_propagation.zip

Wait for a minute (or 2) until you spot this tag which got missing in the upper branch:

Relevant log output

No response