Mark wrote:

I find the same silicone is fine in the bathrooms but goes mouldy in
the kitchen. The temperature and ventilation are not a problem IMHO.

Explain that!

Mould has the ability to metabolise acetate, and can thrive quite
happily on acetate as its sole source of food. Some silicones produce
acetic acid as they cure which gets trapped within the sealant, and
gives the mould all it needs in the way of energy.

Warm damp kitchen provides the right environment for growth, your
bathroom may be too cold (possibly).

Difficult to make any definitive statement, but using a neutral cure
sealant can help to avoid problems.