PP saving soil depths incorrectly setting LBLEV=0

[trexfeathers]

🐛 Bug Report

Expected behaviour

PP saving Single depth level (soil depth) should be setting pp.lblev correctly per level, rather than the current default of 0.

Screenshots

Environment

• Iris Version: known for v2.3 onwards, but likely historic too

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[ESadek-MO]

Related to #3820

[ESadek-MO]

So, after a bit of digging it seems pp.lblev can't be calculated within the _vertical_rules. There is the potential that there might be identifiers after this stage which would allow pp.lblev to be set, but I'm yet to find a straightforward solution to this.

[ESadek-MO]

@SciTools/peloton think that the solution to this is to include user-side workarounds in the Further Topics documentation.