Updated to 0.17.70 and got this message on loading:
Error in assignID, entity with name 'ghost-constant-combinator-remnants' does not exist.
Source: ghost-constant-combinator (constant-combinator).
Mods to be disabled:
• TrainsSignalSender
• attach-notes
• Will-o-the-Wisps_updated
I guess it's related to this change in Factorio:
Graphics
Added new remnants for several entities. They are still work-in-progress and subject to further change.