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In Odoo 14.0, the way to attach chatter to model was changed.

In previous version of Odoo, we were used following way to add chatter to model:

<div class="oe_chatter">
    <field name="message_follower_ids" widget="mail_followers" groups="base.group_user"/>
    <field name="activity_ids" widget="mail_activity"/>
    <field name="message_ids" widget="mail_thread"/>
</div>

But, in Odoo 14.0, chatter could be added without specification of widget for each field

<div class="oe_chatter">
    <field name="message_follower_ids"/>
    <field name="activity_ids"/>
    <field name="message_ids" options="{'post_refresh': 'recipients'}"/>
</div>

Thus we have to remove using widgets on chater. and possibly add opttions (if needed)

This issue affects all modules that use chatter.