System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: Intel(R) HD Graphics 4600 Intel 4.3.0 - Build 20.19.15.4835
Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-10 23:46, hash: rB676543d91f5c
Worked: 2.79
Short description of error
The generated texture space coordinates reset to the Auto texture space behavior when any modifier is attached to the object. This happens for EEVEE and Cycles.
btw, based on some chat I thought this bug was reported months ago, so I didn't report it. Now I tried to search it in the reports (like for an hour) and don't see it anywhere, so sorry if this is double report.
Exact steps for others to reproduce the error
Uploading a file here, which shows the same cube with same mapping settings (1,1,1 scale and auto tex space off)
and with some modifiers (bevel, subsurf)
