I'm relieved that I didn't have to deal with Worksmanager in the last 18 month. We had the issue with the not broken dependencies already 4 years ago. That was the reason why we always exported SVD/SVL and uploaded manually. You're telling me that they haven't managed to fix this in the last 4 years!!!???
One other thing I realized while looking at the file, even with that P_Tin layer disabled, was the rather sluggish behavior of the 3D view in TBC. You still got about 27000 lines with over 200000 vertices on the screen. If TBC already struggles than Earthworks is going to crap itself.
With that Tin Layer it's 158000 lines with 478000 vertices.
The two contour layers with 418 lines alone bring 64000 nodes.
And get rid of all the grates and fences in P_Silt_Fences_3 and P_STRM_STRC_GRAT_3, 17800 lines with 95000 nodes.
If the linework is of no value to an excavator operator, then don't include it.
To manually break the dependency of a surface you can create a copy with "Offset surface" and 0.000.