diff --git a/docs/releases/unreleased.md b/docs/releases/unreleased.md
index 4b894aa5..69d5c5ed 100644
--- a/docs/releases/unreleased.md
+++ b/docs/releases/unreleased.md
@@ -33,6 +33,8 @@ Example:
 
 - (#1964) Fixed Microsoft Calendar OAuth so connecting no longer forces a fresh consent prompt every time, and clarified the Microsoft desktop app setup steps.
   - Thanks to @thechonta for reporting.
+- (#1966) Fixed custom priority icons so they render as icons instead of filled squares on task cards.
+  - Thanks to @sruiz-savia for reporting.
 - (#1963) Fixed Google Calendar sync so duplicate event ID fields are repaired when saving task calendar metadata.
   - Thanks to @christenbc for reporting.
 - (#1961) Fixed the default custom filename template so it uses the recommended double-brace syntax and no longer warns on first use.
diff --git a/styles/task-card-bem.css b/styles/task-card-bem.css
index 9ca7a2aa..ad0f41a0 100644
--- a/styles/task-card-bem.css
+++ b/styles/task-card-bem.css
@@ -1050,6 +1050,10 @@ body.is-mobile .tasknotes-plugin .task-card__context-menu svg {
     justify-content: center;
 }
 
+.tasknotes-plugin .task-card[data-priority] > .task-card__main-row .task-card__priority-dot--icon {
+    background-color: transparent;
+}
+
 .tasknotes-plugin .task-card--priority-high > .task-card__main-row .task-card__priority-dot--icon,
 .tasknotes-plugin .task-card--priority-medium > .task-card__main-row .task-card__priority-dot--icon,
 .tasknotes-plugin .task-card--priority-normal > .task-card__main-row .task-card__priority-dot--icon,
diff --git a/tests/unit/issues/issue-1966-priority-icon-background.test.ts b/tests/unit/issues/issue-1966-priority-icon-background.test.ts
new file mode 100644
index 00000000..be3bdfaa
--- /dev/null
+++ b/tests/unit/issues/issue-1966-priority-icon-background.test.ts
@@ -0,0 +1,29 @@
+import fs from "fs";
+import path from "path";
+
+function readRepoFile(relativePath: string): string {
+	return fs.readFileSync(path.resolve(__dirname, "../../../", relativePath), "utf8");
+}
+
+function extractCssBlock(css: string, selector: string): string {
+	const escapedSelector = selector.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
+	const match = css.match(new RegExp(`${escapedSelector}\\s*\\{([^}]*)\\}`));
+	return match?.[1] ?? "";
+}
+
+describe("Issue #1966: priority icon backgrounds", () => {
+	it("keeps priority icon indicators transparent after data-priority color rules", () => {
+		const css = readRepoFile("styles/task-card-bem.css");
+		const colorSelector =
+			".tasknotes-plugin .task-card[data-priority] > .task-card__main-row .task-card__priority-dot";
+		const iconSelector =
+			".tasknotes-plugin .task-card[data-priority] > .task-card__main-row .task-card__priority-dot--icon";
+
+		const colorRuleIndex = css.indexOf(colorSelector);
+		const iconRuleIndex = css.indexOf(iconSelector);
+
+		expect(colorRuleIndex).toBeGreaterThanOrEqual(0);
+		expect(iconRuleIndex).toBeGreaterThan(colorRuleIndex);
+		expect(extractCssBlock(css, iconSelector)).toContain("background-color: transparent");
+	});
+});