[2.1.17] Desync when construction robot places a spidertron

[Furgers]

Got a repro for this one:

spidertron-desync-repro.zip

(1.91 MiB) Downloaded 15 times

1. Load save
2. Use Shift+Space to target and fire upon the spidertron that is over your crashed ship (rocket launcher is equipped)
3. Continue firing until the spidertron is destroyed
4. Quickly use /toggle-heavy-mode
5. When the construction bot places the spidertron ghost left by the destroyed spider, heavy mode check fails

I also have the check failure files in case the repro doesn't work:
Server: https://drive.google.com/file/d/1xkYPUX ... sp=sharing
Client: https://drive.google.com/file/d/1-CpIRT ... sp=sharing

Notes from my own testing:
The spidertron's legs being deflected seems to be important. A spidertron that has just been placed or is over open ground does not trigger the same issue.
It does not matter if the spider is moved manually or by spidertron remote
I did not test other destruction or placement methods.

[Rseding91]

Thanks for the report and excellent reproduction. This is now fixed for the next release.