Is it a bug that hitchhiker traps disappear?

[土木作業員-見習い]

The text may be strange because it is written using Google Translate.

Ask about hitchhiker traps.
There are three traps in possession. It may disappear when the trap is collected.
It may also disappear if you repair a damaged trap and try to possess it. Is this by design? I have contacted the management and have yet to receive a response. If anyone knows more about hitchhikers please let me know

[literally 1984]

100% a bug, dev team should respond soon

[土木作業員-見習い]

Thank you for your reply. It's a bug.
Again, the reproducibility is irregular because there are few verifications.

Current bug pattern
(1) Can be obtained by picking up a broken trap or
May disappear upon acquisition

② You can get it even if you repair the broken trap and pick it up. 　or　
May disappear at the same time as possession