It appears 1.4.0 may manually override the user’s pmic settings (as you suspected @epbwhiz), but that’s why we have Release Canidates :
This “fix” might be a step backwards for Solar Powered Borons (power critical) where the only benefit is to increase charging current to mains powered Borons (unlimited power source, IE: not power critical).
Who can we tag to answer the question:
Can we eventually set a “Solar” Flag for the PMIC to not use the 1.3.1 modifications that override
setInputVoltageLimit, causing a Solar Panel’s voltage to collapse?
Solar Panel Users actually would benefit from access to a higher setting than (5080), but dropping
setInputVoltageLimit to (3880) despite the User’s PMIC settings seems detrimental.