I have encountered this bug as well. However I found the culprits are the duplicants.
Constructing mesh tiles, and once finished, building pipes inside them will sometimes cause duplicants to misstake the mesh tile for a ordinary diggable tile. In such a scenario they would haul the construction materials (so far as expected) then proceed to "dig" the tile (as if the pipe was planned on a "natural" tile). Digging appears to cause what the game recognizes as pressure damage to the mesh tile. The mesh tile can't be destroyed by pressure damage (which makes sense) and the duplicants will not proceed with the actual construction of the pipe until the mesh tile is destroyed. This causes them to keep digging the mesh tile endlessly, past the point of dropping the mesh tile to 0 "health".
The screenshot features two such duplicants trying to dig mesh tiles. Please note that hovering over the duplicant (Catalina) indicates that she is "Digging". The same goes for the other Duplicant (Harold).
I suspect you probably confuse the repairing animation with the digging animation.
EDIT: in my second screenshot I attempted to dissuade the duplicants from their deconstructive behaviour by ordering them to move away. They will return and resume digging the mesh tile.
The second screenshot shows that a dig task has been assigned.
trying to cancel the dig task is not possible without cancelling construction of the pipe. Doing so will remove the pipe "ghost" and yield the cosntruction material which was intended for the cancelled task. This material will however be trapped inside the mesh tile rather than drop below (or placed on top of) the mesh tile as expected. Note the tiny sandstone triangle in my third screenshot.
(fun fact: Harold gained a skill increase for digging while doing this ... not going to post a screenshot of that though).
Waiting for a duplicant to repair the mesh tile works as expected ... causing a second duplicant to repair the mesh tile while the other one still attempts to dig it. Allowing the repairs to finish brings us back to square one where we have a dig task on a mesh tile.
Tasking the removal of the mesh tile works around the problem, allows the duplicant (to believe he/she) finished digging the tile and resume construction. This allows to rebuild the mesh tile AFTER the pipe has been finished.
I have not encountered this with normal built tiles (like some apparently have), but I witnessed it happen with Airflow tiles as well. (which caused several tons of polluted water to cave into the hydrogen airchamber below (which in turn caused said hydrogen to rise to the roof where it wasn't intended to ever go) ... causing a bit of a mess to say the least. The fact that mesh tiles take substantially longer to rebuild than pipes was just the tip of the iceberg until aforementioned happened.)
FINAL EDIT (I hope):
If it helps: I have witnessed this to happen with both gas pipes and liquid pipes (insulated editions as well). the screenshots feature iron mesh tiles and sandstone gas pipes. (In other cases, I also used wolframite liquid pipes, granite gas pipes and finally insulated abyssalite gas- and liquid pipes.)