1. Restart server
2. Encounter at least 1 of the issues in T752
3. Reload a design (successfully)
4. Unload the design
5. Marvel at your invisible shipyard anchor
TO FIX:
6. Re-link shipyard computer with shipyard anchor with 'C' - 'V'
7. Anchor appears again
Reproducible once you get some other issue with the shipyard, all new placed anchors after you encounter this issue (without fixing it) are also invisible. Not sure about the case of multiple shipyards on the same structure.