Losing field data with validation

We are currently encountering a situation where when we enable validation on
either a multiple_select or multiple_checkbox type we will lose data if we enter
more than one option at a time.

If we remove validation from these fields they appear to behave normally.
Any tips you can provide, were only interested at present in ensuring the fields
are required using multiple choices

{
"field_name": "langcheck",
"label": "Language Checkbox",
"preset": "multiple_checkbox",
"required": true ,
"validators": "scheming_required",
"choices": [
{"value": "en-CA [default]", "label": "English (Canadian)"},
{"value": "fr-CA", "label": "French (Canadian)"}
]
},
{
"field_name": "langselect",
"label": "Language Select",
"preset": "multiple_select",
"required": true ,
"validators": "scheming_required",
"choices": [
{"value": "en-CA [default]", "label": "English (Canadian)"},
{"value": "fr-CA", "label": "French (Canadian)"}
]
},

Start by reproducing the issue in CKAN using the provided multiple_checkbox and multiple_select schemas with scheming_required enabled, comparing behavior with validation removed. Trace the validation and submission handling for multi-value fields; done means required validation works without losing any selected options.

Written by the indexing model from the issue text.