Managing absence policy stage 1 or supportive employers

Crikey - I’m so lucky that my employers have been absolutely fantastic. I work for a local authority and there’s been no issue at all with my time off. I had 8 cycles of chemo and did my best to work on my good week (apart from a couple), so managed to eke out almost 9 months of treatment into 6 months off - which meant that I stayed on full pay throughout. Their normal policy is that any 3 absences in 6 months lead to a referral to HR, but cancer’s not included in that.
Hope everyone out there having problems, finds a solution - how awful that some managers behave like that, hope to God that they never find themselves in the same situation x