Here are the prints in 5.9.1 and 5.9 (where in the former case enviroment has been uniformized to 5.9 by specifying some package versions).
Diff for trace is 0 but for logp here it is:
diff logp-dlogp_5_9.txt logp-dlogp_5_9_1.txt
2257c2257
< └─ exp [id BNS] 't4'
---
> └─ exp [id BNS] 't1'
2263c2263
< └─ exp [id BNS] 't4'
---
> └─ exp [id BNS] 't1'
2267c2267
< └─ exp [id BNS] 't4'
---
> └─ exp [id BNS] 't1'
2290c2290
< ├─ GE [id BOP] 't8'
---
> ├─ GE [id BOP] 't14'
2300c2300
< │ ├─ GE [id BOP] 't8'
---
> │ ├─ GE [id BOP] 't14'
trace_5_9_1.txt (1.4 KB)
logp-dlogp_5_9_1.txt (203.0 KB)
trace_5_9.txt (1.4 KB)
logp-dlogp_5_9.txt (203.0 KB)