[PROJ] ETRS89 issues with PROJ 9.8.0

[Even Rouault]

Hi,

We're hearing alarm bells coming from various European users related to 
transformations between pre-ETRS89 national CRS an ETRS89-based CRS,  
caused by significant changes in that area that have been introduced in 
the EPSG dataset embedded in PROJ 9.8.0. Namely the creation of 
ETRS89-XXX datums where XXX is the ISO code of the country.

https://github.com/OSGeo/PROJ/pull/4736 exposes a few of the issues met, 
an a partial workaround, but not covering all cases. Please also report 
issues you might hit in that area.

We are working with EPSG to help fix the situation. For people mastering 
their supply chain, reverting back to 9.7.1 might be prudent.

Even

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