SmatZ opened the ticket and wrote:

r10053 and newer

issuing CMD_REMOVE_ROAD with p2 bit 6 set may cause an assertion because test and exec run will differ when removing road. (test run - cost is returned, exec run - fails, there is tram track)
Client has to be modified to issue this command. (remove road from rail+road+tram crossing with p2.bit6 = 1)

There are several ways to solve this - forbid CMD_REMOVE_ROAD for network, use some helper function called with special parameter from CmdRemoveLongRoad, or allow removing more road types in one command (or some other way to fix clearing crossing than in r10053)

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/1692