Strange behaviour of "expand" in CAS view (Xcas problem?)

[Nigel (UK)]

Typing

Code:

expand(x*2.9+6.3)

gives

Code:

2.9*x+6.3

(correct).

Typing

Code:

expand(x*2.9e-13+6.3e-13)

gives

Code:

(1+x)*6.3e-13

(not correct).

This happens when both powers of ten are -13 or smaller.

This also happens in Xcas on my PC (in the latest stable and unstable versions).

Nigel (UK)