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Optimization on MTK based SteadyStateProblem fails with AutoForwardDiff due to MTKParameter type change

bugSomething isn't workingSomething isn't working

Status: Open.

#4898 In SciML/ModelingToolkit.jl;

· BambOoxX opened on Aug 6, 2026

Wrong dense output in the event-truncated step for mass-matrix systems with SymbolicContinuousCallback

Status: Open.

#4896 In SciML/ModelingToolkit.jl;

· baggepinnen opened on Aug 6, 2026

mtkcompile is nondeterministic: identical systems alternately compile and throw ExtraVariablesSystemException within one session

Status: Open.

#4890 In SciML/ModelingToolkit.jl;

· mx-p9a opened on Aug 5, 2026

Linearization fails without input/ouput

bugSomething isn't workingSomething isn't working

Status: Open.

#4886 In SciML/ModelingToolkit.jl;

· BambOoxX opened on Aug 5, 2026

Indexing in SteadyStateSolution fails

Status: Open.

#4885 In SciML/ModelingToolkit.jl;

· BambOoxX opened on Aug 5, 2026

QA: ModelingToolkit depends on ~140 non-public names of its dependencies

Status: Open.

#4882 In SciML/ModelingToolkit.jl;

· ChrisRackauckas-Claude opened on Aug 5, 2026

Second order stochastical differential equation does not compile

bugSomething isn't workingSomething isn't working

Status: Open.

#4878 In SciML/ModelingToolkit.jl;

· henrik-wolf opened on Aug 5, 2026

Intermittent TearingState failure with Int-typed @discretes: "X is present in the system but X is not an unknown" despite isequal/hash-consistent parameter

Status: Open.

#4871 In SciML/ModelingToolkit.jl;

· baggepinnen opened on Aug 4, 2026

Continuous-event affects silently not invoked: affect_neg with discrete-dependent thresholds, and one-sided events with identical conditions

Status: Open.

#4870 In SciML/ModelingToolkit.jl;

· baggepinnen opened on Aug 4, 2026

Integrator Resetting with Discrete Callback

bugSomething isn't workingSomething isn't working

Status: Open.

#4869 In SciML/ModelingToolkit.jl;

· bradcarman opened on Aug 4, 2026

Plotting N clocked variables yields N+1 series, the first empty, shifting all legend labels

Status: Open.

#4868 In SciML/ModelingToolkit.jl;

· baggepinnen opened on Aug 4, 2026

remake_buffer skips eltype promotion for mixed-portion ParameterIndex collections → MethodError: Float64(::Dual)

bugSomething isn't workingSomething isn't working

Status: Open.

#4864 In SciML/ModelingToolkit.jl;

· SebastianM-C opened on Aug 3, 2026