TGeoTubeSeg problem

After updating to new root (5.34.11 from 5.34.05) I have observed that
my geometry produces strange results.

When running in TGeant3 my tracks produce too many points along the particle trajectory.
It seems that the particle enters and exits one single volume many many times
(more than 100 times for 1 cm of gas).

In TGeant4, the tracks have ZERO energy loss, but the particles enter and exit
volumes once.

In order to bring back the normal behaviour, (1 entrance and 1 exit per volume with
reasonable, non-zero energy loss), it is enough to:
1/ copy geom/geom directory from 5.34.05 and recompile,
2/ or to change my geometry from TGeoTubeSeg to TGeoTube.

Therefore I think something happened to TGeoTubeSeg between versions 5.34.05 and 5.34.11
that make it unusable. Can it be fixed?

yours
Radoslaw Karabowicz