Why is my shinyBS tooltip for a textInput() not shown?

I'm building a Shiny app where I use bsTooltip() from the shinyBS package to show hover-based tooltips over question mark icons next to input labels. This works fine for most inputs like sliderInput() and checkboxInput(), but does not show tooltips for textInput() fields, even though I use the same label pattern. In other parts of my code the tooltips show up for textInput() as well.

Here's a minimal reproducible example (taken from one of my tabs):

library(shiny)
library(shinyBS)

ui <- fluidPage(
  titlePanel("ShinyBS Tooltip Issue: textInput vs Others"),

  # Tooltips defined for various elements
  bsTooltip("mtPatternHelp",
            "Regex pattern used to identify mitochondrial genes. Default '^MT-' is for human data.",
            placement = "right", trigger = "hover"),

  bsTooltip("sliderHelp",
            "Set the range of interest for the plot Y-axis.",
            placement = "right", trigger = "hover"),

  bsTooltip("checkboxHelp",
            "Check to save the plots to disk.",
            placement = "right", trigger = "hover"),

  sidebarLayout(
    sidebarPanel(

      # Tooltip does NOT show on hover
      textInput("mtPattern",
                label = tagList(
                  "Mitochondrial gene pattern",
                  tags$span(
                    icon("question-circle"),
                    id = "mtPatternHelp",
                    style = "margin-left: 5px; cursor: pointer; color: #1c9ed8;"
                  )
                ),
                value = "^MT-"
      ),

      # Tooltip WORKS correctly
      sliderInput("someSlider",
                  label = tagList(
                    "Y-axis limit",
                    tags$span(
                      icon("question-circle"),
                      id = "sliderHelp",
                      style = "margin-left: 5px; cursor: pointer; color: #1c9ed8;"
                    )
                  ),
                  min = 0, max = 100, value = c(10, 90)
      ),

      # Tooltip WORKS correctly
      checkboxInput("savePlot",
                    label = tagList(
                      "Save plots?",
                      tags$span(
                        icon("question-circle"),
                        id = "checkboxHelp",
                        style = "margin-left: 5px; cursor: pointer; color: #1c9ed8;"
                      )
                    ),
                    value = TRUE
      )
    ),

    mainPanel(
      verbatimTextOutput("out")
    )
  )
)

server <- function(input, output, session) {
  output$out <- renderPrint({
    list(
      mtPattern = input$mtPattern,
      slider = input$someSlider,
      save = input$savePlot
    )
  })
}

shinyApp(ui, server)

The issue is the question mark icon appears, but hovering over it does nothing.

This is because in the tooltip title

"Regex pattern used to identify mitochondrial genes. Default '^MT-' is for human data."

you have special characters which have to be escaped. Use

"Regex pattern used to identify mitochondrial genes. Default \\'\\^MT-\\' is for human data."

and it will show up: