Update pymc/distributions/timeseries.py

Co-authored-by: Ricardo Vieira <[email protected]>

Author: canyon289

pymc/distributions/timeseries.py

@@ -180,6 +180,8 @@ def dist(
                 mu_ = at.broadcast_arrays(mu, sigma)[0]
                 init = change_rv_size(init, mu_.shape)
 
+        init.tag.ignore_logprob = True
+
         return super().dist([mu, sigma, init, steps], size=size, **kwargs)
 
     def logp(