2019.2.6 - Build Report - 50% used by shaders and file headers - why?

2019.2.6 - Build Report for android target:

Uncompressed usage by category (Percentages based on user generated assets only):
Textures 62.9 mb 36.9%
Meshes 3.6 mb 2.1%
Animations 1.6 mb 1.0%
Sounds 1.6 mb 0.9%
Shaders 41.9 mb 24.5%
Other Assets 1.0 mb 0.6%
Levels 2.6 mb 1.5%
Scripts 1.1 mb 0.6%
Included DLLs 13.3 mb 7.8%
File headers 41.1 mb 24.1%
Total User Assets 170.7 mb 100.0%
Complete build size 494.3 mb

P.S. I have only 3 files in Resources folder total size 30 kb

Should I report a bug or is there known solution?..