error when trying to symbol-index for a parameter which was updated by an event

[TorkelE]

This currently yields an error:

using ModelingToolkit, OrdinaryDiffEqDefault
using ModelingToolkit: SymbolicContinuousCallback,
                       SymbolicDiscreteCallback,
                       t_nounits as t,
                       D_nounits as D
@parameters p(t) d
@variables X(t)
eqs = [
    D(X) ~ p - d*X
]
cevents = [SymbolicContinuousCallback([t ~ 1.0] => [p ~ 1.0]; discrete_parameters = [p])]
@mtkcompile model = System(eqs, t; continuous_events = cevents)

prob = ODEProblem(model, [:X => 1.0, :p => 2.0, :d => 2.0], (0.0, 2.0))
sol = solve(prob)
sol.ps[:p] # ERROR: BoundsError: attempt to access Tuple{Int64, Int64} at index [3]
sol.ps[:d] # 2.0
sol[:X] # 10-element Vector{Float64}:

on [961ee093] ModelingToolkit v10.29.0 and v1.12.1

[vyudu]

same as #3978 I think, I will try to get the fix PR #3979 updated today