[BUG] Matching boundaries act weirdly when enabled

[haykh]

describe the bug
Some issues with NaNs produced when enabling matching boundaries in non-Cartesian SR reported by @SChernoglazov

code version
1.2.0rc

[haykh]

@SChernoglazov could you tell which flags/pgen you used?

[haykh]

Closed with #116