ZX Spectrum - raining effect

[Conan]

More Russian software use IM2 vector table in slow memory area (16384-32767 and slow mem pages on ZX48/128/+2/+3). This ZX models contain HW bug in HAL10H8 chip and if high adress byte of vector table (register I) is set to this slow (contended) memory, ZX is very unstable and ULA show in screen raining effect. ZX will crash.

As I know the problem of crash (if the register I has a bin value 01xx xxxx) was fixed in ZX Spectrum 128 (+2) and later. In addition ZX Spectrum +2A/B/+3 has no snow effect at all.
Another question is a different addressing of slow/fast pages (by the 7FFDh port) in Sinclair’s and Amstrad’s Speccies. Probably you called it “bug in HAL10H8 chip”.
P.S. In ZX Spectrum (48K) a HAL10H8 chip never used.