Priest/church Planner invited to reception?

I don’t think it’s necessary, but is polite at the same time. My in-laws invited their priest and he declined, my parents invited their priest and he only stayed for dinner, and we invited ours but he declined.

If they receive payment from you there is no reason to invite them. You aren't planning invite your baker or h&mua, are you? If the church personnel don't receive payment, but rather you make a donation to the congregation, then you should invite them. More likely than not, they will decline.

We were getting married by a priest and I was not planning on inviting him.
However, now we are getting married by the deacon who is doing all our preceding cousiling and we’ve invited him and his wife.
We did not invite the church coordinator though.

We plan on inviting the pastor who will be marrying us to the reception, but we were also invited to his wedding reception this year so I think partially it depends on how close you are to the officiant.

I think it's one of those things that's not necessary but is polite. Especially if the ceremony and reception are in the same venue.

In most Catholic weddings I've been to, those close to their priest invite them to their reception. In return, the priest might do a blessing before dinner.

We are having my step father officiate so no brainer there

if you do not have a personal relationship and are paying for a service I don’t see them as any different than any other vendor, my caterer will not be invited to my ceremony and a coordinator from the church would not be invited to my reception

Most priests would not go to a party reception. Sometimes if having an officiant at a non church wedding you invite them for rehearsal dinner, since they will already be conducting the rehearsal, but otherwise I do not think many priests would show up to a reception for a wedding. As long as you are donating to the church!