Hi @anon83643364,
The #community:general-discussion-feedback area of the forum is not for bug reporting.
Please file a bug report on Zendesk, using the “Submit a Request” option on the top menu bar. Include a detailed location.
After reporting to zendesk, you can also post in the #bugs-and-issues categories for members on the forum to see.
There are existing topics on this:
Glitches in Waterways:
Glitches - Raised Waterways -Height Issues - in Waterways - Lakes, Rivers, Bays - Bugs & Issues / Scenery - Microsoft Flight Simulator Forums
Ground Spikes:
Ground or Terrain Spikes - Bugs & Issues / Scenery - Microsoft Flight Simulator Forums