Steps to reproduce:

1) Download attached project 'BugLodFade.zip' and open in Unity
2) Build and Run 'Main' scene on a device
Observe the right cube and you will see distortions when custom dissolve shader is applied

Expected result: Right cube should be dissolved same as the left one (check attached video 'expected.mp4')
Actual result: Right cube produces graphical distortions (check attached video 'actual.mp4')

Reproduced with:
5.5.4p4, 5.6.3p3

Shader didn't worked at all using Unity 2017.1.x, 2017.2.x and 2017.3.x

Devices under testing:
Reproduced with:
Samsung SM P600 (Galaxy Note 10.1)*, OS:5.1.1, CPU:armeabi-v7a, GPU:Mali-T628, Build:samsung/lt03wifixx/lt03wifi:5.1.1/LMY47X/P600XXUDQA1:user/release-keys
Verizon SM G930V*, OS:6.0.1, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:Verizon/heroqltevzw/heroqltevzw:6.0.1/MMB29M/G930VVRU2APG3:user/release-keys
Samsung SM G900F (Galaxy S5)*, OS:6.0.1, CPU:armeabi-v7a, GPU:Adreno (TM) 330, Build:samsung/kltexx/klte:6.0.1/MMB29M/G900FXXS1CQD1:user/release-keys

Not reproduced with:
Samsung GT P5200 (Galaxy Tab 3 10.1)*, OS:4.4.2, CPU:x86, GPU:PowerVR SGX 544MP2, Build:samsung/santos103gxx/santos103g:4.4.2/KOT49H/P5200XXUBNL1:user/release-keys