fixed > 1.10 compiles forever

I have an embedded project where fixed is being used. Using a fixed version for fixed 😇 (=1.10.0) works fine but as of 1.11 the compiler runs forever (until stopped after a few minutes)

other used crates:

[dependencies]
cortex-m = "0.7.3"
cortex-m-rt = "0.7.0"

embedded-hal = { version = "0.2.6", features=["unproven"] }
embedded-time = "0.12.0"

num-traits = { version="0.2.14", default-features=false}
fixed = { version = "=1.10.0", features = ["az", "num-traits"] }
fixed-sqrt = "0.2.4"
typenum = "=1.14.0"
az = "1.1"

Is there an easy explination for this?