As a former PM I will say you need to sort this out very quickly, unless there's some level of management between you and PM that you haven't mentioned. The PMs job usually includes getting expert estimates on man-hours and timelines, and it sounds like this part may have simply been delegated to you directly in the past. Your new PM might feel a stronger sense of responsibility, a smaller crew means higher visibility for each crew member, so you need to book a time to literally sit and ask about the processes in place and whether you can help by providing your expertise and experience at an earlier stage of the planning. This probably needs to be resolved somehow (even if it's just a matter of both sides feeling comfortable with what the other side is doing) and communication is the only way to get there.
A daily 15 minute standup going over each project in order of delivery date would go a lot further and allow OP to manage their own time like the adult they are.
Thanks, there is no management between myself and the PM, I report to another person. I’ve been involved in different stages of the proposal ie I’ve been asked how long a project may take (roughly). These tend to be existing customers so we’d be involved, the new projects are mostly for new customers which has been costed and by the time it ends up either the engineer, it’s driven by the PM by micromanaging my calendar. On top of this we have a half hour call as well as a group chat that gets pinged through out the day.