You can override predefined properties ('languages' for example) using new base field definitions.
$fields["languages"] = BaseFieldDefinition::create('string_long')
->setRequired(self::requiredSection('languages'))
->setLabel("Languages");
$this->languages will be overridden.This issue might be reproducible using base_field_alter hook.
Simply prevent adding fields like these by checking their keys, and throw and exception if one of them matches a predefined property. We should do this because errors like these are extremely silent and can cause other issues. This is tested with $this->languages property.
Needs work
10.1 ✨
Enhances developer experience.
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Deprecation doesn't follow the standard template. Should link to a change record.
Also needs a simple test checking for deprecation call.