`dx.make_subplots` empties plots after clickthrough

[alexpeters1208]

There are cases where dx.make_subplots can kill its constituent plots and render them empty. Here is an example:

from deephaven import time_table
import deephaven.plot.express as dx

t_scatter = time_table("PT0.2s").update(
    [
        "Group = ii % 2 == 0 ? `A` : `B`",
        "X = Group == `A` ? randomGaussian(-5.0, 1.5) : randomGaussian(3.5, 5.0)",
        "Y = Group == `A` ? randomGaussian(4.0, 4.0) : randomGaussian(-0.5, 2.5)"
    ]
)

t_line = time_table("PT0.2s").update(
    ["X = 0.05 * ii", "Y1 = X * sin(X)", "Y2 = 5 * X * cos(X)"]
)



group_scatter_plot = dx.scatter(t_scatter, x="X", y="Y", by="Group")

line_plot_multi = dx.line(t_line, x="X", y=["Y1", "Y2"], yaxis_sequence=[1, 2])

combined_plots = dx.make_subplots(
    group_scatter_plot,
    line_plot_multi,
    rows=1, cols=2, shared_xaxes=False, shared_yaxes=False
)

Here is the result:
https://github.com/user-attachments/assets/0741e195-b719-4d2b-a3a5-c757c2201de4