Wrong site override when calling replace! on AbstractQuantum with already existing index

[mofeing]

using Tenet
using LinearAlgebra

mat = reshape(LinearAlgebra.I(4), 2, 2, 2, 2)
gate = Quantum(mat, [site"2", site"3", site"2'", site"3'"])

oinds = Dict(site"2" => :B, site"3" => :C)

tmpinds = Dict(site => gensym(:tmp) for site in sites(gate; set=:inputs))
replace!(gate, [inds(gate; at=site) => i for (site, i) in tmpinds])

# HERE IS THE BUG
replace!(gate, [inds(gate; at=site) => i for (site, i) in oinds])

The result of gate.sites is

julia> gate.sites
Dict{Site, Symbol} with 4 entries:
  3  => :C
  3' => Symbol("##tmp#272")
  2' => Symbol("##tmp#271")
  2  => :C

when it should be

julia> gate.sites
Dict{Site, Symbol} with 4 entries:
  3  => :C
  3' => Symbol("##tmp#272")
  2' => Symbol("##tmp#271")
  2  => :B

In simple_update!, I've fixed it by calling it twice with some temporary indices in between, but we have to fix it to make it work without this workaround.

replace!(gate, [inds(gate; at=site) => gensym() for (site, i) in oinds])
replace!(gate, [inds(gate; at=site) => i for (site, i) in oinds])